The kitchen osmosis system has been detached by customer for ease of re pipe work being done by us.

He wants re pipe for whole house.

He wants his cup filler faucet and refrigerator treated by the R.O when, we are done with the re pipe.

A copper tube exists from under the sink, through cabinets and walls, and cabinets again, to the fridge.

He wants tube replaced with, 1/2" pex.

Is this going to work with 1/2" pex?

What will be needed to adapt the 1/2" to the reverse osmosis?

Or, is there a better way to have the R.O treating the cup filler faucet by kitchen sink and the ice box for the fridge?

use the copper tube

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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638

Just to be clear, be sure to never use copper after the r.o. system as reverse osmosis water will leach minerals from copper pipe.

I have an RO system with 6 gal storage tank. The RO system is in the mechanical closet by the well pump, and a 1/4" pex tube runs from the RO system to a tee in the crawlspace, where it then runs to both the separate tap by kitchen sink and the fridge. Regardless of RO system capacity, using 1/2" is a waste since you'll have to reduce to 1/4" at the fridge and faucet.

i stand corrected re: copper and RO water


you can use copper TO the RO system, but NOT to distribute the pure water FROM the system



i would use HDPE 1/4" OD tubing for distribution if said tube is NOT in the wall itself (inside 'accessible' cabinetry is just fine)

This is NOT poly or low density LLDPE but High Density Poly-Ethylene tube (add cross linked and you get PEX)



as an example: [www.hudsonextrusions.com]


it is also sold (although often 'hidden') at the big box stores - it is semi-flexible, less than pex, more than vinyl or PE, but, due to the small OD necessary easier to work than soft shell copper

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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638



Edited 1 times.

You are correct, "pex" has become the catch phrase for non-metallic tube. It is HDPE and often sold as "ice maker tubing"